問題詳情
【題組】72. Jae Kwon gave examples in Paragraph 4_________.
(A)to show chemical batteries are widely applied.
(B)to introduce nuclear batteries can be safely used.
(C)to describe a nuclear-powered system.
(D)to introduce various energy sources.
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)